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JPH0555692

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH0555692
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat drive type speaker, and more particularly to a flat drive type speaker having an efficient
magnetic circuit and excellent productivity.
[0002]
2. Description of the Related Art FIG. 5 shows an example of a conventional flat drive type
speaker, and a flat drive type speaker S3 has a flat type yoke 3 disposed on the bottom surface
side of a speaker frame 6 and an upper surface of the yoke 3 A plurality of magnets 4 of rod
magnets are disposed at predetermined intervals, and a top plate 5 is provided on the top surface
of each magnet 4 to form a magnetic gap G between adjacent top plates 5; The flat diaphragm 1
stretched above the magnetic circuit portion and the voice coil 2 provided on the flat diaphragm
so as to correspond to the magnetic gap, and the voice coil 2 is a film diaphragm. The pattern coil
13 is formed by etching. In the figure, reference numeral 7 denotes a lead wire of the pattern coil
13. Also, the conventional flat drive speaker S4 in FIG. 6 has an adhesive on the back side of the
flat diaphragm 1 so that the voice coil 21 formed in a circular, elliptical or rectangular shape is
disposed in the magnetic gap G. It was fixed at 91. In the figure, 9 is a coil bobbin.
[0003]
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Although the flat drive speaker S3 shown in FIG. 5 has an advantage that the entire speaker can
be made thin, there is a disadvantage that the conversion efficiency is poor. On the other hand, in
the flat drive speaker S4 shown in FIG. 6, although the conversion efficiency is improved, there is
a drawback that the productivity is bad because the work of forming the voice coil 21 and the
bonding work are required.
[0004]
SUMMARY OF THE INVENTION The object of the present invention is to improve the
disadvantages of the above-described conventional flat-drive loudspeakers and to provide a flatdrive loudspeaker excellent in productivity as well as having a good conversion efficiency.
[0005]
SUMMARY OF THE INVENTION In a flat drive type loudspeaker according to the present
invention, a plurality of magnets are arranged at a predetermined interval on a flat yoke and a
top plate is placed on each of the magnets. A magnetic circuit portion arranged and forming a
magnetic gap between adjacent top plates, a flat diaphragm tensioned above the magnetic circuit
portion, and the flat diaphragm provided corresponding to the magnetic gap In the flat drive
speaker including the voice coil, a groove is formed on the flat diaphragm so as to be inserted
into the magnetic gap, and the voice coil is fixed and arranged in the groove.
The plane diaphragm is formed of a gel-like film of poly-p-phenylene-terephthalamide. With the
above-described configuration, it is possible to divide and form a plurality of reproduction units
having different reproduction frequency bands with respect to one plane diaphragm.
[0006]
Since the groove is formed on the flat diaphragm and the voice coil is fixed in the groove, the
productivity is excellent. Since the voice coil is disposed in the magnetic gap, the conversion
efficiency is extremely good. is there.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flat driving
type loudspeaker according to the present invention will be described with reference to FIGS. 1
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2
to 4. FIG.
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, FIG. 2 is a
front view showing a second embodiment, FIG. 3 is a cross-sectional view of a flat drive type
loudspeaker in FIG. It is sectional drawing which shows an example, but attaches | subjects the
code | symbol same about the components same as the conventional one demonstrated in FIG. 5
and FIG. 6, and abbreviate | omits the description. In FIG. 1, S indicates a speaker unit, and a flat
plate-like yoke 3 is provided on the bottom surface side of the speaker frame 6, and a plurality of
magnets 4 are disposed on the top surface of the yoke 3 at predetermined intervals. A top plate 5
is provided on the upper surface of the magnet 4, and a magnetic gap is formed between the
facing top plates 5 to form a magnetic circuit portion G. A flat diaphragm 1 is stretched above the
magnetic circuit portion G, and the flat diaphragm 1 is formed of a film or the like, and is folded
downward like a hook at a position corresponding to the magnetic gap. Thus, the groove 11 is
formed, and the voice coil 2 is fixed and disposed in the groove 11 with an adhesive or the like.
In the drawing, reference numeral 7 denotes a lead wire, 8 denotes a terminal, 12 denotes an
edge, and the yoke 3 is provided with a recess 32 corresponding to the groove 11 and the
magnet 4 has an inner periphery and an outer periphery, respectively. An elliptical magnet is
used as a magnetic pole.
[0008]
A film material of poly-p-phenylene-terephthalamide is used as the plane vibration plate 1 in the
present embodiment, and the film material is made into a gel-like film by using pure water as a
solvent. Further, since the elongation rate is increased when the gel-like film is molded at a
molding temperature of 300.degree. C., it goes without saying that the edge 12 can be integrally
formed, and the length, width, shape, etc. of the groove portion 11. Can be set arbitrarily in
accordance with various conditions of the voice coil 3 etc. to be arranged in the groove. Further,
in the flat diaphragm 1 molded under the above conditions, the modulus of elasticity is increased
because the crystallinity of the film is increased, and the sound velocity is 3900 m / sec. The
voice coil 2 was made of aluminum edgewise, and an SV varnish was applied as an adhesive to
the groove 11 and fixed at 180 ° C. for 30 minutes.
[0009]
Since the groove 11 of the flat diaphragm 1 is formed corresponding to the magnetic gap, the
voice coil 2 disposed in the groove 11 can be driven extremely efficiently. It is located in the
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magnetic field even in the case of large amplitude because it extends to the vicinity of. In
addition, when the voice coil impedance and the driving force of the magnetic circuit unit were
the same as in the conventional case and the efficiency was compared, it was found that the
efficiency was improved by 1 to 2 db and the reproduction frequency band was also expanded.
[0010]
Next, a second embodiment will be described based on FIG. 2 and FIG. 3. In the figure, S1 is the
entire flat drive type speaker, and a flat diaphragm 1A formed in a substantially triangular shape
is used. Grooves 11A, 11B, and 11C are formed, and edge portions 12A, 12B, and 12C are
formed around the grooves, respectively, and formed so as to divide the plane diaphragm 1A into
ovals with different areas, and the reproduction frequency The reproduction | regeneration part
from which a zone | band differs, ie, tweeter part Y1, the squawker part Y2, and the woofer part
Y3, are comprised.
[0011]
The reproduced sound from the tweeter Y1, the squawker Y2 and the woofer Y3 is divided by a
network to form a thin speaker system, and its characteristics are measured. The on-axis
efficiency is 89 db, the reproduction band 35 to 16000 Hz Speaker system was obtained.
Further, by dividing one flat diaphragm 1A, the tweeter portion Y1, the squawker portion Y2, and
the woofer portion Y3 can be configured, so that the frame (not shown) of the speaker unit
becomes simple, and the production efficiency Improve.
[0012]
Next, the flat drive speaker S2 according to the third embodiment will be described based on FIG.
4. In the flat diaphragm 1B, the grooves 11D, 11E, 11F are concentric so that the flat diaphragm
1B is divided. The portions of the flat diaphragm 1B which are formed in a circular shape and
surrounded by the grooves 11D, 11E and 11F respectively constitute reproduction portions of a
tweeter portion Y4, a squawker portion Y5 and a woofer portion Y6.
[0013]
In this case, since the reproduction section having different reproduction frequencies is
constituted by dividing the plane diaphragm 1B into concentric circular shapes, the area of the
plane diaphragm 1B should be utilized to the maximum extent.
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[0014]
According to the flat drive speaker of the present invention, since the groove is integrally formed
on the flat diaphragm and the voice coil is fixedly arranged in the groove, the productivity is
extremely high. When the poly-p-phenylene-terephthal-amide is used as the material of the flat
diaphragm as in the embodiment, not only the shape of the groove can be freely set according to
the voice coil, but also the flat diaphragm Since the elastic modulus is increased, the reproduction
frequency can be expanded.
Further, since the groove portion is formed on the flat diaphragm so as to correspond to the
magnetic gap and the voice coil is fixedly disposed thereon, the voice coil can be surely
positioned in the magnetic field, and the reproduction efficiency is enhanced. Can.
Furthermore, by dividing one flat diaphragm by the groove portion, it is possible to configure the
reproduction portion having different reproduction frequency, so it is possible to provide a flat
drive type speaker excellent in productivity.
[0015]
Brief description of the drawings
[0016]
1 is a cross-sectional view showing a first embodiment of the present invention.
[0017]
2 is a front view showing a second embodiment.
[0018]
3 is a cross-sectional view of the flat drive speaker in FIG.
[0019]
4 is a cross-sectional view showing a third embodiment.
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[0020]
5 is a cross-sectional perspective view showing an example of a conventional flat drive speaker.
[0021]
6 is a cross-sectional perspective view showing another conventional example.
[0022]
Explanation of sign
[0023]
S Flat Drive Speaker 1 Flat Diaphragm 11 Groove 2 Voice Coil 3 Yoke 4 Magnet 5 Top Plate 6
Speaker Frame
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